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Slagging method for rail steel

A rail steel and slag adjustment technology, which is applied in the field of rail steel slag adjustment, can solve the problems of low desulfurization efficiency and achieve high desulfurization efficiency, desulfurization efficiency and the effect of improving cleanliness

Active Publication Date: 2017-03-08
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the desulfurization efficiency of this application is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The molten iron entering the converter furnace is 0.016%. After the converter smelting is completed, the steel is tapped. During the tapping process, silicon-calcium-barium alloy is added to the ladle for deoxidation. The addition amount is 2.5kg / t steel. Other alloys required. When the tapped steel is 90 tons, add active lime 5kg / t steel into the ladle. After tapping, evenly add corundum slag 1.0kg / t steel and calcium carbide 0.2kg / t steel to the ladle slag surface. In the above tapping process, the argon gas flow rate of ladle bottom blowing is 60Nl / min. After tapping, blow argon for 6 minutes with a bottom blowing argon flow rate of 50Nl / min, and then send the molten steel to LF for refining.

[0035] After the molten steel arrives at the LF station, turn on the bottom argon blowing to carry out argon blowing at the bottom of the ladle. After adding slag, continue heating and refining; after refining for 10 minutes, adjust the flow rate of argon blowing at the bot...

Embodiment 2

[0038]The molten iron entering the converter is 0.020%. After the converter smelting is completed, the steel starts to be tapped. During the tapping process, silicon-calcium-barium alloy is added to the ladle for deoxidation. The addition amount is 3.5kg / t steel. Other alloys required. When the tapped steel is 90 tons, add active lime 5kg / t steel into the ladle. After tapping, 3.0kg / t of corundum slag and 0.4kg / t of calcium carbide are evenly added to the slag surface of the ladle. In the above tapping process, the argon gas flow rate of ladle bottom blowing is 60Nl / min. After tapping, blow argon for 6 minutes with a bottom blowing argon flow rate of 50Nl / min, and then send the molten steel to LF for refining.

[0039] After the molten steel arrives at the LF station, turn on the bottom argon blowing to carry out argon blowing at the bottom of the ladle. Continue heating and refining after adding slag; after refining for 10 minutes, adjust the flow rate of argon blowing at ...

Embodiment 3

[0042] The molten iron entering the converter is 0.010%. After the converter smelting is completed, the steel is tapped. During the tapping process, silicon-calcium-barium alloy is added to the ladle for deoxidation. The addition amount is 3.0kg / t steel. Other alloys required. When the tapped steel is 90 tons, add active lime 3kg / t steel into the ladle. After tapping, evenly add corundum slag 2.0kg / t steel and calcium carbide 0.3kg / t steel to the ladle slag surface. In the above tapping process, the argon gas flow rate of ladle bottom blowing is 60Nl / min. After tapping, blow argon for 6 minutes with a bottom blowing argon flow rate of 50Nl / min, and then send the molten steel to LF for refining.

[0043] After the molten steel arrives at the LF station, turn on the bottom argon blowing to carry out argon blowing at the bottom of the ladle. After adding slag, continue heating and refining; after refining for 10 minutes, adjust the flow rate of argon blowing at the bottom of t...

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Abstract

The invention discloses a slag adjusting method of rail steel. The method comprises the following steps: active lime is adopted to wash slag in a converter tapping process; then, calcium carbide and corundum slag are adopted to modify steel ladle top slag; the modified steel ladle is fed to LF for slag adjustment; the active lime and the calcium carbide are adopted to refine; at least two batches are added in the process; and the argon flow is 100-200 Nl / min at the early stage, 100-200 Nl / min at the middle stage and 100-150 Nl / min at the later stage. The content of sulfur in molten steel treated by LF is not more than 0.006%; quartz sand is added in the later period of LF treatment to reduce the steel ladle slag alkalinity; and after the refining is continuously performed by proper time, the RH vacuum treatment is performed. The method is suitable for producing high-quality rail steel; and the content of sulfur in steel is not more than 0.006%.

Description

technical field [0001] The invention relates to the technical field of rail steel smelting, in particular to a method for adjusting slag of rail steel. Background technique [0002] In the prior art, the slagging method of rail steel produced by the converter-LF-RH-continuous casting process flow has been reported, and for a kind of slagging method using active lime in the converter, active lime and quartz sand in the refining process The refining method has not been reported. [0003] For example, the patent application number is 201210243888.2, which discloses a method for rapid desulfurization of heavy rail steel refining. This method is to add lime into the ladle during the tapping process of the converter, and the amount of lime added in each ton of molten steel is 3~ 4kg; and when "slag washing" is formed in the tapping process, the sulfur in the LF furnace steel is ≤0.020%; the slag is melted at a temperature of 1510-1530°C, and a deoxidizer is added during the heati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/36C21C7/04C21C7/064C21C7/10
Inventor 陈亮陈天明杨森祥郭华黄禹明李红光黄德胜杨文中陈雄冯远超
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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